It’s a question we’re hearing more often as vehicles become increasingly software-driven.
Recently, we had a 2023 Range Rover arrive at our workshop after the customer noticed the battery repeatedly going flat. The issue first appeared after a software update, so it was easy to assume the update was to blame.
However, as is often the case with modern vehicles, the timing turned out to be a coincidence rather than the cause.
Did the Software Update Cause the Problem?
The vehicle had recently received a Software Over The Air (SOTA) update.
These updates are delivered remotely by the manufacturer and, in most cases, focus on infotainment improvements, bug fixes and minor software enhancements. While software can sometimes contribute to battery drain, it’s important not to jump to conclusions without carrying out the correct diagnostic process.
At Shaikly Motor Company, we always test the evidence before replacing parts.
Not All 12-Volt Batteries Are the Same
The first step was to assess the vehicle’s 12-volt battery.
On previous generations of vehicles this would have been relatively straightforward. However, the latest Range Rover uses a 12-volt lithium starter battery, which is very different from a conventional lead-acid battery.
In fact, the battery isn’t even easily accessible. It’s mounted underneath the vehicle, making replacement a far more involved job than many owners would expect.
These lithium batteries also require different charging procedures. Under the bonnet, Land Rover specifies a maximum charging or jump-start voltage of 13.6 volts, meaning the correct equipment must be used to avoid damaging the battery.
Following the Correct Diagnostic Process
Using the manufacturer’s diagnostic equipment, we attempted to carry out a battery health assessment. Initially, the test would not complete.
Rather than assuming the battery had failed, we checked the manufacturer’s technical information and confirmed the battery first needed to be charged correctly.
Using our GYS Flash professional battery support unit in lithium mode, we charged the battery before repeating the manufacturer battery test through the Land Rover diagnostic system.
This time the result was clear:
“Do Not Replace Battery.”
That was excellent news for the customer.
Not only was the battery healthy, but replacing it would have involved around 90 minutes of labour, with the battery itself costing well over £1,000.
Accurate diagnostics prevented an unnecessary repair.
The Real Cause
With the battery confirmed to be in good condition, we continued our investigation.
Further research identified a manufacturer software update relating to quiescent current drain—the small amount of electrical current the vehicle continues to use while parked.
If this current draw is higher than intended, it can gradually discharge the battery over time.
Our colleague successfully carried out the latest manufacturer software update designed to address this issue, resolving the customer’s concern without replacing any components.
Modern Diagnostics Save Customers Money
This repair is a perfect example of why we never rely on assumptions.
A flat battery doesn’t automatically mean the battery has failed.
A recent software update doesn’t automatically mean the update caused the problem.
Modern vehicles are packed with advanced electronics, specialist battery technology and dozens of interconnected control modules. Finding the root cause requires the correct equipment, access to manufacturer information and, most importantly, a structured diagnostic process.